EASY DUCT™ - Technical Manual - Engineering Specifications - Flange Duct Specification

Oct 28, 2026

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EASY DUCT™ Technical Manual documents engineering specifications for clamp-together ductwork systems, including duct-work construction methods, continuous laser welded seams, and rolled-end reinforcement. It specifies sealing options (Nitrile for standard installs and Gortex for mist/food grade), component materials and finishes (galvanized and stainless 304 2B), and dimensional ranges with increment rules. Sections also cover flange duct configuration, Van Stone flange connection cross-sections, and support spacing requirements to maintain lateral stability. Material gauge guidance and temperature and gasket standards are referenced for installation.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages40

Reading Time1 h 41 min

AccessFree to download

DESCRIPTION PAGE

Engineering Specifications

Flange Duct Specification

Van-Stone Flange Connection Cross Section

Clamp Diagram

Clamp Gasketing Alternatives

Adjustable Nipple O-Ring Material

EASY DUCT™ TECHNICAL MANUAL THE EASY DUCT ADVANTAGE • Simple to install-No special tools or training required • Clamp-together components can be taken apart and reused • Flexible-Easily connects to existing ductwork • Components and adapters fit every system • Adjustable duct fittings simplify connections • Smooth interior surface helps prevent clogs TABLE OF CONTENTS DESCRIPTION PAGE | Adjustable Nipple Assembly For Dry Application | 34 | | --- | --- | | Adjustable O-Ring Material | 4 | | Air Volume Chart | 37 | | Blast Gate (Auto) | 17 | | Blast Gates (Manual & Energy Saving) | 18-19 | | Bleed-In Valve | 15 | | Branch Styles | 31 | | Ceiling Hanging Method | 23 | | Clamp Diagram | 3 | | Clamp Gasketing Alternatives | 4 | | Construction Methods | 5 | | Diverter Valve | 20 | | Dry System Installation | 30 | | Elbows & Fittings | 6 | | Engineering Specifications | 1 | | Flanged Duct Specifications | 2 | | Flashing (Wall & Roof) | 21 | | Gauge Limitations | 8 | | Gauge Upgrades For Elbows | 7 | | Gripple Hanger System | 24 | | High Temp Fume Or Exhaust Applications | 28 | | In-Line Sound Silencer | 26 | | Installing An In-Cut Or Tap-In | 16 | | Labor Guidlines & What To Be Aware Of When Ordering | 27 | | Leakage | 10 | | No-Loss Stack-Head | 26 | | Oil Mist Or Wet Application For Pipe | 35 | | Oil Mist Or Wet Application For Installation Of Adjustable Nipple | 36 | | Pipe Stand With Bracket Hanger | 23 | | Reducer Styles | 32 | | Rigid & Ultra Flex Hose | 14 | | Rubber Flex Hose | 13 | | Sizing A System & Cfm/Fpm Chart | 11 | | Sizing Branches | 33 | | Sizing Elbows & Special Components | 12 | | Structural Integrity & Collapsibility | 9 | | Wall Mounting | 22 | | Wet System Installation | 29 | i Donaldson Torit ENGINEERING SPECIFICATIONS DUCT-WORK: All duct-work shall be of a clamp-together design using a die-formed, rolled edge in which is then joined together by a single lever clamp of similar material. All clamp together ducting shall be of continuous laser welded construction along the longitudinal seam of the rolled form duct with the exception of the 3” which is lock formed. All connections shall have Nitrile seal in clamp for standard installs and a Gortex seal for mist or food grade applications. Duct material sheet blanks are five feet long, which is then rolled and fused Together with a laser weld process along the longitudinal seam. The ends of the duct are then pressed in a die to from a rolled bead on each end of the duct. This rolled-end is used for clamping components together as well as reinforcement every 5 feet. COMPONENT MATERIAL: Straight duct and other connecting components to be constructed of galvanized sheets produced by the continuous galvanizing process in which conforms to ASTM-A-527, and commercial quality ASTM A-527 . Galvanized sheeting is produced with a minimum spangle. Stainless duct-work is constructed of stainless steel to be 304 2B finish (2B finish in annealed, pickled and bright cold rolled) . ADDITIONAL INFORMATION: For more information regarding gauges of materials, temperature ratings etc. Refer to charts contained in this Technical-Specification Manual. Duct diameters for Easy Duct as follows: Easy Duct 3” through 17” available in 1” increments 18” through 24 ” available in 2” increments NOTE: 3” DUCT IS LOCK FORM, NOT LASER WELDED [donaldsontorit.com | 800-365-1331](donaldsontorit.com | 800-365-1331) 1 FLANGE DUCT SPECIFICATION VAN-STONE FLANGE CONNECTION CROSS SECTION A)“Flanged” = Material sheet blanks are 78.75” lg. and rolled with a longitudinal lock formed seam. A angle flange made from angle bar stock rolled on edge is placed on the end of the duct using a Van Stone Flange Connection as illustrated above. (See Easy Duct Catalog for sizes) B) Duct should be supported as follows: *3”-10” diameter = 12’ -15’ centers *11”-24” diameter = 15’-20’ centers Supports should be installed to provide lateral stability to entir

FAQs

What sealing options does the Easy Duct system specify for different applications?

For standard installs, connections use a Nitrile seal in the clamp, while mist or food grade applications use a Gortex seal.

How is the duct-work constructed and welded along the seam?

Duct-work uses a clamp-together design with a die-formed rolled edge joined by a single lever clamp, and clamp-together ducting is continuous laser welded along the longitudinal seam (with a noted exception for the 3”).

What are the support spacing requirements for flange duct installations?

The manual specifies support centers of 12’-15’ for 3”-10” diameters and 15’-20’ for 11”-24” diameters, providing lateral stability for the piping system.

Oct 28, 2026

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